Line in a track from the album Faction (4)
I believe the answer is:
cult
'faction' is the definition.
(religious faction)
'line in a track from the album' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'in' indicates putting letters inside.
'a track from the album' becomes 'cut' (I can't justify this - if you can you should give a lot more credence to this answer).
'l' put into 'cut' is 'CULT'.
Can you help me to learn more?
(Other definitions for cult that I've seen before include "Popular cause, fashion" , "Esoteric religion" , "Narrow or excessive devotion to person or religious system" , "unorthodox organisation" , "System of religious worship, may be for minority" .)